الفهرس 
2.1 Ecological studiesOnly 14 pages are availabe for public view
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Abstract
The first part of the present study was carried out on five plants belonging
to family Solanaceae; Solanum nigrum L.v. humile Bernh, Datura stramonium
L., Withania somnifera L., Hyoscyamus muticus L., and Nicotiana glauca
Graham in order to evaluate and compare their medicinal importance in
different organs of the plants. These plants were investigated for the content of
carbohydrates, protein, lipids and some secondary metabolites such as alkaloids,
saponins, phenolic compounds, tannins and flavonoids. The preliminary results
of the present study revealed that Nicotiana glauca contained appreciable
amounts of carbohydrates, protein, lipids and secondary metabolites such as
flavonoids, tannins, phenolic compounds, alkaloids and saponins. Also, the
plant has been reported to grow and adapt to a wide range of different ecological
conditions. So, the second part of the study was designed to investigate the
influence of different ecological conditions (climatic and edaphic factors) in
four habitats (sand plains, sand dunes, salt marshs and roadsides) on the
structure, water content, organic matter and plant nutrient elements, in addition
to the chemical constituents including primary and secondary metabolites of
Nicotiana glauca. The results showed that different environmental conditions affected the
synthesis and accumulation of various active constituents in Nicotiana glauca.
The contents of primary and secondary metabolites have been influenced by the
prevailing soil conditions. Environmental stresses of both drought and salinity
induced the accumulation of some nutrient elements, soluble carbohydrates,
protein, amino acids (proline) and flavonoids especially in the leaves and
flowers of Nicotiana glauca.